import Vue from 'vue'
import Router from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcome from '../components/Welcome.vue'
import Users from '../components/user/Users.vue'
Vue.use(Router)

const router = new Router({
  routes: [
    {path: '/', redirect: '/login'},
    {path: '/login', component: Login},
    {
      path: '/home', component: Home,
      redirect: '/welcome',
      children: [
        {path: '/welcome', component: Welcome},
        {path: '/users', component: Users}
      ]
    }
  ]
})
//挂载路由导航守卫
router.beforeEach((to, from, next) => {
  // to将要访问路径
  // from 从哪里跳转而来
  //next是一个函数,表示放行
  //next()放行  next('/login')强制跳转
  if (to.path === '/login') return next()
  const tokenStr = window.sessionStorage.getItem('token')
  if (!tokenStr) return next('/login')
  // 放行
  next()
})
export default router
